Nuclear slowing-down factors in alkali-metal vapors

• URL: http://arxiv.org/abs/2609.08261v1
• Date: Tue, 08 Sep 2026 05:05:08 GMT
• Title: Nuclear slowing-down factors in alkali-metal vapors
• Abstract summary: Nuclear slowing-down factors account for the sharing of angular momentum between the electron and the nucleus.<n>For collinear optical pumping and magnetic field, longitudinal and transverse spin dynamics are characterized by different polarization-dependent slowing-down factors.
• Score: 0.1784233255402269
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Nuclear slowing-down factors account for the sharing of angular momentum between the electron and the nucleus in the effective Bloch description of alkali-metal spin dynamics in the spin-exchange-relaxation-free (SERF) regime. For collinear optical pumping and magnetic field, we find that longitudinal and transverse spin dynamics are characterized by different polarization-dependent slowing-down factors. Transverse dynamics are governed by the conventional factor $q(p)$, with $p$ the electron spin polarization, whereas longitudinal relaxation is governed by $q(p)+p\,dq(p)/dp$. The two factors coincide at zero polarization but differ substantially at high polarization, where the single-factor description overestimates the underlying pumping and relaxation rates inferred from longitudinal transients by factors approaching two to four, depending on the nuclear spin. We further derive closed-form expressions, valid at arbitrary polarization, for the residual spin-exchange relaxation of the transverse spin components at finite magnetic field along the pumping axis. This contribution is quadratic in the magnetic field and can become comparable to the zero-field linewidth at fields well within the SERF regime. The results are obtained by perturbation theory on the density-matrix dynamics linearized around the stationary state and are verified by numerical solutions of the microscopic density-matrix equation. These findings refine the effective Bloch description of alkali-metal spin dynamics and are directly relevant to atomic magnetometers and alkali-metal--noble-gas comagnetometers, including those used in precision searches for physics beyond the Standard Model.

Related papers

• Anisotropic two-dimensional magnetoexciton with exact center-of-mass separation [3.3421154214189293]
  This work develops an exact framework for c.m. and relative motion separation in anisotropic 2D magnetoexcitons.<n>Results demonstrate the significant influence of anisotropy-dependent coupling on magnetic response in systems with strong mass anisotropy.<n>This formalism is generalizable to other anisotropic 2D semiconductors.
  arXiv  Detail & Related papers  (2026-03-02T16:38:09Z)
• Magnetically assisted spin-resolved electron diffraction: Coherent control of spin population and spatial filtering [0.0]
  A self-consistent Maxwell-Pauli framework is developed to study spin-resolved electron diffraction from nanogratings in the presence of magnetic fields.<n> Numerical simulations show that the intrinsic magnetic self-field produced by the electron probability current is several orders of magnitude too weak to induce measurable spin mixing.<n>The proposed approach enables spatial tunable separation of spin-resolved free electron beams and establishes an all-magnetic route for coherent spin rotation, control, and interferometry.
  arXiv  Detail & Related papers  (2026-02-17T14:43:01Z)
• Quantum optical scattering by macroscopic lossy objects: A general approach [55.2480439325792]
  We develop a general approach to describe the scattering of quantum light by a lossy macroscopic object placed in vacuum.<n>We exploit the input-output relation to connect the output state of the field to the input one.<n>We analyze the impact of the classical transmission and absorption dyadics on the transitions from ingoing to outgoing s-polariton.
  arXiv  Detail & Related papers  (2024-11-27T17:44:29Z)
• Dynamical Reorientation of Spin Multipoles in Silicon Carbide by Transverse Magnetic Fields [0.0]
  Application of weak magnetic fields to the symmetry axis leads to nontrivial behavior caused by dynamical reorientation of the $mathrmV_Si$ spin multipole under optical excitation. Our theoretical calculations reproduce well all sharp features in the spin perpendicular resonance spectra, and shine light on the complex dynamics of spin multipoles in these kinds of solid-state systems.
  arXiv  Detail & Related papers  (2024-04-11T16:59:03Z)
• Spin relaxation in inhomogeneous magnetic fields with depolarizing boundaries [24.03686690579752]
  Field-inhomogeneity-induced relaxation of atomic spins confined in vapor cells with depolarizing walls is studied.<n>In contrast to nuclear spins, such as noble-gas spins, atomic spins in uncoated cells undergo randomization at the boundaries.<n>A deviation in high input-power scenarios arises from pump field attenuation, resulting in a non-uniformly distributed light shift.
  arXiv  Detail & Related papers  (2024-03-13T07:15:50Z)
• Unveiling the Quantum Toroidal Dipole [41.99844472131922]
  We present a complete quantum-mechanical formalism for the TD in a nanostructure.<n>We propose the first spectroscopic method for its direct measurement.<n>This provides a clear experimental blueprint to unveil, measure, and characterize this elusive third multipole moment.
  arXiv  Detail & Related papers  (2024-01-26T13:31:32Z)
• Super narrow peaks in excitation spectrum of alkali spin polarization: non-adiabatic case of spin dynamics [0.0]
  Non-adiabatic spin dynamics occurs in a gas cell filled by alkali vapor. S Steep increase of the spin polarization occurs if frequency of the magnetic field is equal to the certain value.
  arXiv  Detail & Related papers  (2023-07-24T09:39:07Z)
• Spin Current Density Functional Theory of the Quantum Spin-Hall Phase [59.50307752165016]
  We apply the spin current density functional theory to the quantum spin-Hall phase. We show that the explicit account of spin currents in the electron-electron potential of the SCDFT is key to the appearance of a Dirac cone.
  arXiv  Detail & Related papers  (2022-08-29T20:46:26Z)
• Probing dynamics of a two-dimensional dipolar spin ensemble using single qubit sensor [62.997667081978825]
  We experimentally investigate individual spin dynamics in a two-dimensional ensemble of electron spins on the surface of a diamond crystal. We show that this anomalously slow relaxation rate is due to the presence of strong dynamical disorder. Our work paves the way towards microscopic study and control of quantum thermalization in strongly interacting disordered spin ensembles.
  arXiv  Detail & Related papers  (2022-07-21T18:00:17Z)
• Controllable nonreciprocal optical response and handedness-switching in magnetized spin orbit coupled graphene [0.0]
  We calculate the dynamical optical conductivity and permittivity tensor of a magnetized graphene layer with Rashba spin orbit coupling (SOC) Our results reveal a transverse Hall conductivity correlated with the usual nonreciprocal longitudinal conductivity. It is found that the magnetized spin orbit coupled graphene supports strong handedness-switchings, effectively controlled by varying the chemical potential and magnetization strength with respect to the SOC strength.
  arXiv  Detail & Related papers  (2022-01-05T19:00:02Z)
• Anisotropic electron-nuclear interactions in a rotating quantum spin bath [55.41644538483948]
  Spin-bath interactions are strongly anisotropic, and rapid physical rotation has long been used in solid-state nuclear magnetic resonance. We show that the interaction between electron spins of nitrogen-vacancy centers and a bath of $13$C nuclear spins introduces decoherence into the system. Our findings offer new insights into the use of physical rotation for quantum control with implications for quantum systems having motional and rotational degrees of freedom that are not fixed.
  arXiv  Detail & Related papers  (2021-05-16T06:15:00Z)
• General quantum-mechanical solution for twisted electrons in a uniform magnetic field [68.8204255655161]
  A theory of twisted (and other structured) paraxial electrons in a uniform magnetic field is developed. The observable effect of a different behavior of relativistic Laguerre-Gauss beams with opposite directions of the orbital angular momentum penetrating from the free space into a magnetic field is predicted.
  arXiv  Detail & Related papers  (2020-05-13T16:35:10Z)
• Spin current generation and control in carbon nanotubes by combining rotation and magnetic field [78.72753218464803]
  We study the quantum dynamics of ballistic electrons in rotating carbon nanotubes in the presence of a uniform magnetic field. By suitably combining the applied magnetic field intensity and rotation speed, one can tune one of the currents to zero while keeping the other one finite, giving rise to a spin current generator.
  arXiv  Detail & Related papers  (2020-01-20T08:54:56Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.